Grippy tips please

me: i'd like to buy rubber tips for my wife's walker

medical supply store employee (msse): why?
me: because the current tips are too slippery
msse: they're supposed to slip, they're gliders
me: my wife doesn't want glide, she wants grip
msse: that type of walker isn't supposed to grip, it's supposed to glide
me: well, we want it to grip
msse: we don't sell grippy tips for that walker, others had grippy tips and complained they don't last
me: i don't care
msse: if you want the grippy tips, get another walker
me: i just want 2 rubber grippy tips
msse: sorry

i go to another outlet of the same store

me: i'd like to buy rubber tips for my wife's walker
msse2: why?
me: because the current tips are too slippery
msse2: how many do you need?
me: uhhh. 2 sets?
msse2: no problem, here you go..........